Board spokeswoman Candis Cohen says the board will determine whether there was a violation of medical standards. The board has not identified who is under investigation or where the fertility treatment was performed.

The probe was first reported by the Whittier Daily News.

Nadya Suleman of Whittier gave birth to six boys and two girls on Jan. 26. The 33-year-old single mother has six other children. In an upcoming TV interview, NBC reports the mother says all her children were born through in-vitro fertilization by the same specialist.